CC3235MODSF: How to enter MCU LPDS ?

Hi Kobi,

Thank you for your explanation.

1. I changed all UART_readPolling to UART_read in uart_term.c and test it but there's no change of the current consumption.

I added two hook functions in at_commands.c to see whether entering LPDS or not.

After this, when boot it up, the enterToLPDS called.

Hook function of entering LPDS always called when it boot up?

After added the hook function, the ATCommands_displayBanner() does not executed.

The mainThread of the at_commands.c does not working correctly. How to use the hook functions?

2. Do I need to add Power_enablePolicy(); in code of at_commands.c?

    It can be omitted because it's checked from the sysconfig checkbox. Is it right?

Thanks,

Calvin

Why do you want the hook function?

It is typically used for debug only (e.g. toggle a led). It is not needed.

Power_enablePolicy is already enabled in your case (according to the syscfg file and as the hook gets invoked).

If the enterLPDSHookFxn is NULL (or the function does nothing), does the resumeLPDSHookFxn get invoked?

br,

Kobi  

Hi Kobi,

I found the cause that cannot into LPDS even after changed the UART_readPolling to UART_read.

I checked the "Use DMA" box from configuration of UART. It was the cause.

After unchecked it, LPDS works fine.

But with power policy, my project based on at commands doesn't seem to fit it well.

My device's main MCU sends many times of at commands to the CC3235 to connect an AP,

connect a remote server, send and receive data for a communication.

With power policy, the CC3235 goes into LPDS automatically,

So my device's main MCU have to wake the CC3235 everytime just before send an at command. I think it's not graceful.

1. Can I send a custom at command to CC3235 to go into LPDS? (Control manually)

For example, If my device's main MCU send a command like "at+enter_lpds" to CC3235, 

it goes into LPDS and use gpio13 to wake it up.

Is it possible?

2. There's a problem where the CC3235 does not properly read the at command sent by the main MCU.

For example, below is the RX log from main MCU. It is the echo from the CC3235 after sent "at+wlanget=connection," by the main MCU.

( I tested this with "Use DMA" checked because not implemented wake up by gpio yet.)

[2021-01-01T00:06:21][DBG][wifi.c:1388] [ATRx:49]-["

at+wlanget=conne,
ERROR: parse parameters,-4
"]

This seems to be because I changed UART_readPolling to UART_read.

Is there any solution for this?

Thanks,

Calvin

1. Yes, you will need to add such command yourself. It should be used to enable and disable the power policy.

You can also think about replacing this command with an idle timeout (that will get reset every time an AT command is processed) that upon expiration will enable the power policy.

2. I'm not familiar with the issue. Maybe the app has latencies in response to interrupts causing a buffer overrun (i believe you can check this through reading the UART status). You can try to play with task priorities (i'm not sure this use-case was considered when the example was designed). You may also consider reducing the baudrate or adding HW flow control (w RTS/CTS). 

If you are disabling the power policy during AT Commands transfer, you can re-enable the polling mode. 

Br,

Kobi

Hi kobi,

Using timer would be nice.

I'm trying to wake up by gpio. How to set the gpio in sysconfig?